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September Weather in Cairnryan, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Cairnryan, United Kingdom hovers around 14°C (57°F). While you can expect a comfortable maximum of 20°C (69°F), the nights might dip to a chilly 7°C (45°F). Prepare for a soggy experience with 114 mm (4.5 in) of precipitation spread over 19 days. Don't forget to brace yourself for the high humidity, which averages a muggy 88%!

September Temperature in Cairnryan

In September in Cairnryan, the average temperature is 14°C (57°F). The maximum can reach up to 20°C (69°F), while the minimum can dip as low as 7°C (45°F). This mild climate makes Cairnryan an ideal destination for travelers looking to enjoy comfortable outdoor activities.

September Weather in Cairnryan: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Cairnryan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cairnryan, September typically has an average temperature of 14°C (57°F), with highs reaching up to 20°C (69°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec444344465055585856534845
Data source: Temperature data for Cairnryan generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Cairnryan

In Cairnryan in September, the precipitation amount is 114 mm (4.5 in), occurring over the course of 19 days.

September Precipitation Trends in Cairnryan

The chart displays monthly precipitation patterns in Cairnryan, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Cairnryan, September typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec103133100426396113126115160153144
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Cairnryan

In Cairnryan in September humidity is 88%. With an average temperature of 14°C (57°F), this humidity feels like a thick blanket enveloping you, making every step feel heavier and giving a sense of stickiness that can drain your energy quickly while exploring.

September Average Humidity in Cairnryan

This chart illustrates the average monthly humidity levels in Cairnryan, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Cairnryan is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%85%82%84%86%86%88%89%90%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Cairnryan

In Cairnryan in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Cairnryan.

Maximum UV Index Levels in Cairnryan for September

The chart shows the monthly maximum UV Index (UVI) for Cairnryan in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Cairnryan typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123568865311
Data source: Cairnryan September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Cairnryan Compares to Other Months

Weather in Cairnryan varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Cairnryan, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Cairnryan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)103 mm (4.1 inches)87%low
February Weather6°C (44°F)133 mm (5.2 inches)86%low
March Weather7°C (44°F)100 mm (3.9 inches)86%moderate
April Weather8°C (47°F)42 mm (1.7 inches)85%moderate
May Weather10°C (51°F)63 mm (2.5 inches)82%high
June Weather13°C (55°F)96 mm (3.8 inches)84%very high
July Weather14°C (58°F)113 mm (4.5 inches)86%very high
August Weather15°C (59°F)126 mm (4.9 inches)86%high
September Weather14°C (57°F)114 mm (4.5 inches)88%moderate
October Weather12°C (53°F)160 mm (6.3 inches)89%moderate
November Weather9°C (49°F)153 mm (6.0 inches)90%low
December Weather7°C (46°F)144 mm (5.7 inches)86%low

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